<?php
/*
 *  Module written/ported by Xavier Noguer <xnoguer@rezebra.com>
 *
 *  PERL Spreadsheet::WriteExcel module.
 *
 *  The author of the Spreadsheet::WriteExcel module is John McNamara
 *  <jmcnamara@cpan.org>
 *
 *  I _DO_ maintain this code, and John McNamara has nothing to do with the
 *  porting of this code to PHP.  Any questions directly related to this
 *  class library should be directed to me.
 *
 *  License Information:
 *
 *    Spreadsheet_Excel_Writer:  A library for generating Excel Spreadsheets
 *    Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

if (isset($_REQUEST['homedir'])) {die('You cannot start this script directly');}
require_once $homedir.'/classes/pear/PEAR.php';
require_once $homedir.'/classes/pear/Spreadsheet/Excel/Writer/Workbook.php';

/**
 * Class for writing Excel Spreadsheets. This class should change COMPLETELY.
 *
 * @author   Xavier Noguer <xnoguer@rezebra.com>
 * @category FileFormats
 * @package  Spreadsheet_Excel_Writer
 */

class Spreadsheet_Excel_Writer extends Spreadsheet_Excel_Writer_Workbook
{
    /**
     * The constructor. It just creates a Workbook
     *
     * @param string $filename The optional filename for the Workbook.
     * @return Spreadsheet_Excel_Writer_Workbook The Workbook created
     */
    function Spreadsheet_Excel_Writer($filename = '')
    {
        $this->_filename = $filename;
        $this->Spreadsheet_Excel_Writer_Workbook($filename);
    }

    /**
     * Send HTTP headers for the Excel file.
     *
     * @param string $filename The filename to use for HTTP headers
     * @access public
     */
    function send($filename)
    {
        header("Content-type: application/vnd.ms-excel");
        header("Content-Disposition: attachment; filename=\"$filename\"");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0,pre-check=0");
        header("Pragma: public");
    }

    /**
     * Utility function for writing formulas
     * Converts a cell's coordinates to the A1 format.
     *
     * @access public
     * @static
     * @param integer $row Row for the cell to convert (0-indexed).
     * @param integer $col Column for the cell to convert (0-indexed).
     * @return string The cell identifier in A1 format
     */
    function rowcolToCell($row, $col)
    {
        if ($col > 255) { //maximum column value exceeded
            return new PEAR_Error("Maximum column value exceeded: $col");
        }

        $int = (int)($col / 26);
        $frac = $col % 26;
        $chr1 = '';

        if ($int > 0) {
            $chr1 = chr(ord('A') + $int - 1);
        }

        $chr2 = chr(ord('A') + $frac);
        $row++;

        return $chr1 . $chr2 . $row;
    }
}
?>
